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  <meta name="description" content="目标：理解Canal系统中的架构设计  数据库的数据同步的解决方案，一般是基于trigger（触发器）或者是基于log（日志）。基于trigger的模式侵入性比较大，而且对性能也有影响，所以一般采用后者。读取后的log可以通过RocketMQ或者Kafka将日志发送到需要的平台进行处理。本文主要介绍Canal的架构组成，对Canal有个理性的了解。 Canal的特点 基于自己整理，只能说个大概">
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          Canal架构理解
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        <blockquote>
<p>目标：理解Canal系统中的架构设计</p>
</blockquote>
<p>数据库的数据同步的解决方案，一般是基于trigger（触发器）或者是基于log（日志）。基于trigger的模式侵入性比较大，而且对性能也有影响，所以一般采用后者。读取后的log可以通过RocketMQ或者Kafka将日志发送到需要的平台进行处理。<br>本文主要介绍Canal的架构组成，对Canal有个理性的了解。</p>
<h2 id="Canal的特点"><a href="#Canal的特点" class="headerlink" title="Canal的特点"></a>Canal的特点</h2><blockquote>
<p>基于自己整理，只能说个大概</p>
</blockquote>
<ol>
<li>支持HA（高可用） 采用Zookeeper保存各个子模块的状态，让整个增量订阅和消费模块实现无状态化。</li>
<li>并发模式的设计 采用disruptor的设计</li>
<li>支持增量订阅/消费模式 </li>
</ol>
<h2 id="instance架构"><a href="#instance架构" class="headerlink" title="instance架构"></a>instance架构</h2><img src="https://olwr1lamu.qnssl.com/canal%E6%9E%B6%E6%9E%84.jpg" width="75%" alt="canal总体架构"/>

<p>一个instance对应一个数据，server中可以有多个instance</p>
<ul>
<li>eventParser 数据连接，模拟slave和master通信</li>
<li>eventSink 对数据进行处理</li>
<li>eventStore 存储数据</li>
<li>metaManager 消费订阅管理</li>
</ul>
<p>官方（阿里）部署方式：部署8个队列，4M + 100ms的获取</p>
<h3 id="1-EventParser"><a href="#1-EventParser" class="headerlink" title="1.EventParser"></a>1.EventParser</h3><p>如何支持多线程模型？</p>
<h3 id="2-EventSink"><a href="#2-EventSink" class="headerlink" title="2.EventSink"></a>2.EventSink</h3><p>sink 中文：水槽</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">EntryEventSink</span> </span>&#123;</span><br><span class="line">	<span class="keyword">public</span> CanalEventStore&lt;Event&gt; eventStore;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">start</span><span class="params">()</span> </span>&#123;</span><br><span class="line">		<span class="comment">//初始化Handler</span></span><br><span class="line">        <span class="keyword">for</span> (CanalEventDownStreamHandler handler : getHandlers()) &#123;</span><br><span class="line">            <span class="keyword">if</span> (!handler.isStart()) &#123;</span><br><span class="line">                handler.start();</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">boolean</span> <span class="title">sinkDate</span><span class="params">(List&lt;CanalEntry.Entry&gt; entrys, InetSocketAddress remoteAddress)</span> </span>&#123;</span><br><span class="line">	    <span class="comment">// 过滤</span></span><br><span class="line">	    doFilter(events);</span><br><span class="line">	    <span class="comment">// 对evetn实际操作</span></span><br><span class="line">	    doSink(events);</span><br><span class="line">    &#125;</span><br><span class="line">	</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="3-EventStore"><a href="#3-EventStore" class="headerlink" title="3.EventStore"></a>3.EventStore</h3><p>首先Canal采用了Distruptor的缓冲区，与BlockedQueue相对应。<br>如何设计的是消费订阅模型，放到内存中有什么意义？？</p>
<h3 id="4-消费订阅模型（pull-push模型）"><a href="#4-消费订阅模型（pull-push模型）" class="headerlink" title="4.消费订阅模型（pull/push模型）"></a>4.消费订阅模型（pull/push模型）</h3><p>有序/无序的问题</p>
<h2 id="Server模型"><a href="#Server模型" class="headerlink" title="Server模型"></a>Server模型</h2><ul>
<li>Embeded（嵌入式）</li>
<li>Netty（网络）pull模型</li>
</ul>
<h3 id="增量订阅-消费设计"><a href="#增量订阅-消费设计" class="headerlink" title="增量订阅/消费设计"></a>增量订阅/消费设计</h3><p>Message getWithoutAck(int batchSize);<br>void rollback(long batchId);        // 回滚并重新获得数据，需要传参数batchid<br>void ack(long batchId);        // 确认已经消费，需要传参数batchid<br>支持api流式。demo:延迟很高，不断get，等后期在ack();<br><img src="https://olwr1lamu.qnssl.com/%E6%B5%81%E5%BC%8Fapi.jpg"  alt="流式api"/><br>每次get都会产生一个mark，之后的get都是总最后的一个mark开始取。</p>

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          <div class="post-toc motion-element"><ol class="nav"><li class="nav-item nav-level-2"><a class="nav-link" href="#Canal%E7%9A%84%E7%89%B9%E7%82%B9"><span class="nav-number">1.</span> <span class="nav-text">Canal的特点</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#instance%E6%9E%B6%E6%9E%84"><span class="nav-number">2.</span> <span class="nav-text">instance架构</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#1-EventParser"><span class="nav-number">2.1.</span> <span class="nav-text">1.EventParser</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#2-EventSink"><span class="nav-number">2.2.</span> <span class="nav-text">2.EventSink</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#3-EventStore"><span class="nav-number">2.3.</span> <span class="nav-text">3.EventStore</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#4-%E6%B6%88%E8%B4%B9%E8%AE%A2%E9%98%85%E6%A8%A1%E5%9E%8B%EF%BC%88pull-push%E6%A8%A1%E5%9E%8B%EF%BC%89"><span class="nav-number">2.4.</span> <span class="nav-text">4.消费订阅模型（pull&#x2F;push模型）</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#Server%E6%A8%A1%E5%9E%8B"><span class="nav-number">3.</span> <span class="nav-text">Server模型</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#%E5%A2%9E%E9%87%8F%E8%AE%A2%E9%98%85-%E6%B6%88%E8%B4%B9%E8%AE%BE%E8%AE%A1"><span class="nav-number">3.1.</span> <span class="nav-text">增量订阅&#x2F;消费设计</span></a></li></ol></li></ol></div>
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